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Q.

Four lenses of focal length +15cm, +20cm,+150cm and +250cm are available for making an astronomical telescope to produce largest magnification, the focal length of eye-piece should be

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a

+20cm

b

+150cm

c

+15cm

d

+250cm

answer is A.

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Detailed Solution

M=fofe

For highest magnification, focal length of eyepiece should be minimum.

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